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Basis of Presentation and Summary of Significant Accounting Policies - Allowance for Doubtful Accounts Roll Forward (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Beginning balance $ 6,109 $ 5,140
Additions 1,825 1,571
Deduction (1,778) (1,228)
Ending balance $ 6,156 $ 5,483